/**
* Tests that the providersCache object is and remains instanceof ConcurrentHashMap.
*
* <p>ProvidersRegistry.MediaTypeMap uses type ConcurrentHashMap on the providersCache object to
* provide some lock protection on the map when providers are dynamically added. However, lock
* protection is already built into the ProvidersRegistry methods: getContextResolver(),
* getMessageBodyReader(), and getMessageBodyWriter().
*
* <p>However, the second protection (in the ProvidersRegistry methods) is for the cache itself
* which could be written to by two different threads even if they both were getting a single
* MessageBodyReader (i.e. a cache value may be dropped and then two threads come back later and
* try to write a new cache value). Due to some weird HashMap properties, this can blow up in
* weird ways.
*
* <p>Thus, we need to ensure the providersCache continues to be instantiated with
* ConcurrentHashMap.
*/
public void testProtectionModel() throws Exception {
// I need the instantiated object providersCache in the abstract private nested class
// MediaTypeMap, so here we go!
ProvidersRegistry providersRegistry =
new ProvidersRegistry(new LifecycleManagersRegistry(), new ApplicationValidator());
Field field = providersRegistry.getClass().getDeclaredField("messageBodyReaders");
field.setAccessible(true);
Object messageBodyReaders = field.get(providersRegistry);
Field field2 = messageBodyReaders.getClass().getSuperclass().getDeclaredField("providersCache");
field2.setAccessible(true);
Object providersCache = field2.get(messageBodyReaders);
assertTrue(providersCache instanceof SoftConcurrentMap);
}
/**
* Application subclass methods .getClasses and .getSingletons may list provider class or instance
* that is the same as a default Wink provider to override it to establish a new priority order.
*
* <p>The order that the Wink runtime loads providers is: Application.getSingletons
* Application.getClasses system (through wink-providers file) extra jars (through each
* wink-application file)
*/
@SuppressWarnings("unchecked")
public void testOverrideSystemProvider() throws Exception {
ProvidersRegistry providersRegistry = createProvidersRegistryImpl();
assertTrue(
providersRegistry.addProvider(
StringReader.class, 0.5, false)); // registered as a user provider
MessageBodyReader<String> reader1 =
providersRegistry.getMessageBodyReader(
String.class, null, null, MediaType.TEXT_PLAIN_TYPE, null);
// registered twice as a custom user provider with higher priority
// See javadoc for Application.getSingletons to see why we ignore the attempt to add a second
// StringReader
assertFalse(providersRegistry.addProvider(StringReader.class, 0.6, false));
MessageBodyReader<String> reader2 =
providersRegistry.getMessageBodyReader(
String.class, null, null, MediaType.TEXT_PLAIN_TYPE, null);
assertTrue(reader1 == reader2); // object compare to make sure reader2 has been silently ignored
// registered as a system provider
assertFalse(providersRegistry.addProvider(StringReader.class, 0.1, false));
MessageBodyReader<String> reader3 =
providersRegistry.getMessageBodyReader(
String.class, null, null, MediaType.TEXT_PLAIN_TYPE, null);
assertTrue(reader1 == reader3); // object compare to make sure reader3 has been silently ignored
assertTrue(reader2 == reader3); // object compare to make sure reader3 has been silently ignored
// to confirm that the ignores are indeed happening, I need to get the private field
// "messageBodyReaders" object, then it's superclass "data" object and inspect it:
Field field = providersRegistry.getClass().getDeclaredField("messageBodyReaders");
field.setAccessible(true);
Object messageBodyReaders = field.get(providersRegistry);
Field field2 = messageBodyReaders.getClass().getSuperclass().getDeclaredField("data");
field2.setAccessible(true);
HashMap data = (HashMap) field2.get(messageBodyReaders);
Set readers = (Set) data.get(MediaType.WILDCARD_TYPE);
// make there is only one provider in the list to conform to JAX-RS 4.1 first sentence
assertEquals(1, readers.size());
}
